As illuminated protests become more popular worldwide, we revisit some of the pioneers of public use of light in urban messaging – the international group known as the Graffiti Research Lab.

This news anchor needs to lay off the weed before going on the air.

Gwyneth Paltrow drew criticism on Twitter after attempting to raise awareness about food stamps by attempting to live off just $29 in groceries for one week, with some accusing the actress of "poverty tourism."

In this daunting experiment conducted on Nevada's Delamar Dry Lake, Houston teenager Stephanie sends a sand-written greeting from Earth to his dad working at the International Space Station with a little help from a fleet of Hyundai sedans. This message was officially acknowledged as "the largest tire track image" by the Guinness World Records.